Harmful Algal Bloom (HAB) Event Information
Bloom Code 25-3430-B1
Where
Water Body Cayuga Lake
Latitude and Longitude 42.473567, -76.530272
Segment Lakeshore Segment Southwest 2: Cass Park to Glenwood Point
County Tompkins
Extent Large Localized
When
Bloom Reported July 15, 2025 04:30 PM
Bloom Sampled July 15, 2025 04:30 PM
Microscopic Examination
What
Bloom Genera [1]
Microscopy Present Dominant

Bloom Chemistry
[1] Genera - plural of genus, a category of classification in biology that ranks between the family level and the species level. Because there are many different species of bacteria that are difficult to distinguish, it is more useful to classify bacteria by genus rather than species.
[2] Microcystin
Map of HAB event
Bloom Description

Volunteer Reports: The HAB is moving south from the adjacent zone to the north 3288. Sunny and windless all day. Had checked earlier at 12:30 PM and seemed like a bloom was incipient as there were clearly cyanobacteria beginning to gather on the surface but not clearly defined bloom. The are also a lot of "junk" on the surface now, including what may be black clumps and a few white ones.

Weather
Weather
Wind speed
Wind direction
Water Temp
Air Temp